Final answer:
To find the concentration of KCN in a sample, use the stoichiometry of the reaction to determine the moles of FeSCN- produced and apply the relationship between concentration, volume, and moles. As the reaction has a 1:1 stoichiometry, the concentration of KCN will be the same as the moles of FeSCN- in the volume of the solution.
Step-by-step explanation:
To determine the concentration of KCN in a sample by processing it through a reaction that generates FeSCN-, it is assumed that one mole of KCN will produce one mole of FeSCN-. One must consider the stoichiometry of the neutralization
The relationship concentration × volume = moles, allows us to calculate the moles of reactants and products in a titration process. If the volume does not significantly change after adding reagents, the concentration of KCN and the moles of FeSCN- produced would be equivalent, given the 1:1 stoichiometry between them.
Once the moles of FeSCN- are determined, the concentration of KCN in the original sample can be calculated since the number of moles equals the concentration times the volume of the solution. For example, if the stoichiometry indicates that 2.0 x 10-2 moles of FeSCN- were produced, and KCN has a 1:1 stoichiometry with FeSCN-, then the concentration of KCN would also be based on these 2.0 x 10-2 moles within the volume of the solution being analyzed.